What I've tried to show in the safe_ips example is just one thing. That the safe_ips list does not have to be deleted to be modified. The fact that redis semant

What I've tried to show in the safe_ips example is just one thing. That the safe_ips list does not have to be deleted to be modified. The fact that redis semantics allows us to atomically do that is awesome. If process B were to overwrite the write process A had done or the other wa around, due to some timing issues, is irrelevant in the context of this example. If that is a concern, then a multi-exec or a setnx with a time-value is the way to go.